UPD17P136ACT datasheet(68/292 Pages) NEC

68 / 292 page

CHAPTER 7 SYSTEM REGISTER (SYSREG)

7.5.3 IXE = 0 and MPE = 0 (No Data Memory Modification)

As shown in Table 7-9, data memory addresses are not affected by the index register and the data memory row

address pointer.

(1) Data memory manipulation instructions

Example 1.

Execution of “ADD r, m” when general register is in row address 0

R003

MEM

0.03H

M061

MEM

0.61H

ADD

R003, M061

; Addition in memories (0.03H)

← (0.03H) + (0.61H)

As shown in Figure 7-10, when the above instructions are executed, the data in general register

address R003 and data memory address M061 are added together and the result is stored in

general register address R003.

(2) Indirect transfer of data in the general register (horizontal indirect transfer)

Example 2.

Execution of “MOV @r, m” when general register is in row address 0

R005

MEM

0.05H

M034

MEM

0.34H

MOV

R005, #8

; R005

← 8 (Setting of column address of @r)

MOV

@R005, M034 ; Indirect transfer of data in the register (0.38H)

← (0.34H)

As shown in Figure 7-10, when the above instructions are executed, the data stored in data

memory address M034 is transferred to data memory location 38H.

The “MOV @r, m” instruction transfers the contents of the data memory specified by m to a data

memory address with the row address same as m and column address specified by @r.

In the above example, therefore, data at M034 is transferred to 38H whose row address is the

same as that of M034 (= 3) and column address is specified by the contents of R005 (= 8).

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